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Body weight, not height, is linked to depression risk in US adults. This suggests focusing on weight rather than body mass index (BMI) may improve depression prevention and treatment strategies.

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Area of Science:

  • Psychiatry
  • Public Health
  • Epidemiology

Background:

  • Obesity is frequently linked to depression, but the specific body shape dimensions influencing this relationship remain unclear.
  • Body Mass Index (BMI) is a common obesity measure, yet it conflates height and weight, obscuring the individual contributions of each to mental health outcomes.

Purpose of the Study:

  • To investigate the association between various body shape dimensions and depressive symptoms in a large, nationally representative adult sample.
  • To determine whether body weight, height, or BMI are more predictive of depressive symptomatology.

Main Methods:

  • Analysis of data from the National Health and Nutrition Examination Survey (2007-2016) included 23,739 non-pregnant adults aged 20 and older.
  • Depressive symptoms were assessed in relation to body weight, standing height, and BMI, with statistical controls for age, gender, ethnicity, and socioeconomic status.

Main Results:

  • Body weight and BMI significantly predicted depressive symptoms, while standing height did not.
  • Adults in higher weight or BMI categories (top 30-40% for women, top 10% for men) exhibited notably elevated depressive symptoms.
  • The BMI thresholds associated with increased depressive symptoms (≥30 for women, ≥36 for men) exceeded standard definitions of overweight and obesity.

Conclusions:

  • Body weight, independent of height, was associated with concurrent depressive symptoms in the US adult population.
  • Future research should explore whether assessing body weight without height adjustment, unlike BMI, can enhance depression prevention and treatment efficacy.